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[PATCH] mm: rmap with inner ptlock

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rmap's page_check_address descend without page_table_lock.  First just
pte_offset_map in case there's no pte present worth locking for, then take
page_table_lock for the full check, and pass ptl back to caller in the same
style as pte_offset_map_lock.  __xip_unmap, page_referenced_one and
try_to_unmap_one use pte_unmap_unlock.  try_to_unmap_cluster also.

page_check_address reformatted to avoid progressive indentation.  No use is
made of its one error code, return NULL when it fails.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Hugh Dickins 2005-10-29 18:16:31 -07:00 • committed by Linus Torvalds
parent 67b02f119d
commit c0718806cf
3 changed files with 60 additions and 65 deletions
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4
include/linux/rmap.h
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@ -95,8 +95,8 @@ int try_to_unmap(struct page *);
/*
* Called from mm/filemap_xip.c to unmap empty zero page
*/
pte_t *page_check_address(struct page *, struct mm_struct *, unsigned long);
pte_t *page_check_address(struct page *, struct mm_struct *,
unsigned long, spinlock_t **);
/*
* Used by swapoff to help locate where page is expected in vma.